Control device with adjustable stop



Aug. 2, 1949. w. H. DU SHANE 2,477,539

CONTROL DEVICE WITH ADJUSTABLE STOP Filed Aug. 21, 1948 INVENTOR.WALLACE/i DUSHAN Patented Aug. 2, 1949 CONTROL DEVICE WITH ADJUSTABLESTOP Wallace H. Du Shane, Waterloo, Iowa, assignor to DeereManufacturing 00., Dubuque, Iowa, a

corporation of Iowa Application August 21, 1948, Serial No. 45,495

10 Claims. 1

This invention relates to a control device, and more particularly tomeans providing adjustable stops for defining or determining differentlimits of movement of a movable part of the device.

The invention finds particular utility in the speed control means for 2.Diesel engine, for example. In the case of a tractor or industrialequipment powered by a Diesel engine, it is desirable to provide aspeed-governing lever which is manually movable to establish for theengine a wide speed range between a slow idle limit and a high limit;and, as a matter of convenience to the operator, it is desirable toprovide a stop beyond which the control lever cannot be moved so thatthe operator cannot inadvertently cut 011" the engine by moving thecontrol lever past the slow idle position. At the same time, however,provision must be made for cutting 01f the fuel supply to the engine bythe same control lever. Accordingly, the present invention provides astop which is adjustable to the extent that normally it serves toprevent inadvertent movement of the speed-governing lever below the slowidle position but which is shiftable to present a secondary stop whichdetermines the position of the lever in that position thereof in whichit effects stopping of the engine. The arrangement is particularlyuseful in a Diesel engine, since such engine has no electrical ignitionsystem which can be cut out or grounded when it is desired to stop theengine; however, the device is not limited in its applicability toDiesel engines and may be otherwise applied, as will be apparent tothose versed in the art as the disclosure progresses.

An important object of the invention is to utilize the adjustable stopmeans in a control device of the type in which a plurality of membershaving cooperating radial faces are spring pressed into frictionalengagement to provide means for maintaining a control lever or the likein any one of several positions between the maximum positions permittedby the stop means. In such device, it is a feature to provide a platerockable about an axis and having a notch extending angularly thereinwith respect to the rocking axis so as to provide a pair of edges spacedapart angularly. A stop member extends into the notch and has oppositeside portions which are engageable by one or the other of the edges ofthe notch to limit angular movement of the plate or member. The stopelement is displaceable with respect to the plate to dispose a portionthereof of reduced diameter in the notch so that the range of angularmovement of the plate may be increased. The plate constitutes one of aplurality of friction members, and another is a fiat member associatedwith the plate and frictionally engageable therewith. The flat member isloose or non-rotatable with respect to the plate and has an aperturewhich is engaged by a portion of the stop element so that the fiatmember cannot rotate with the plate.

Other objects of the invention include the provision of z a controldevice of simple and inexpensive construction in the form of a casingwhich is completely enclosed and which houses the friction means and thestop means; a control device comprising relatively few parts; and adevice that may be readily adapted to the control of Diesel engines, forexample.

The foregoing and other important objects and desirable featuresinherent in and encompassed by the invention will become apparent as apreferred embodiment of the invention is fully disclosed in thefollowing detailed description and accompanying sheet of drawings inwhich:

Figure 1 is a side elevational view of the control device, showing itsgeneral external appearance;

Figure 2 is a sectional view on the line 2-2 of Figure 1;

Figure 3 is a sectional View on the line 33 of Figure 2, illustrating indot-dash lines a secondary position of the control lever; and

Figure 4 is a detail view of the cover for the casing, as viewed fromits internal face.

The control device illustrated is based on a preferred design in whichthe main support for the parts to be hereinafter described comprises acasing l0 provided with a substantially hollow interior which opens atone side through a circular opening H. The supporting structure may beotherwise constructed, according to the particular requirements in anygiven case. The details set forth here are preferred but should not betaken as limiting the applicability of the invention.

The circular opening II is normally closed by a removable cover I2 whichis generally circular in shape but having a pair of diametricallyopposed apertured ears l3 through which cap screws M may be passed tosecure the cover to the casing ID. The interior of the casing isprovided with a boss l5 which is recessed by a bore IS with whichcommunicates a reduced counterbore l1. The counterbore ll provides abearin for carrying a rockshaft Hi. The rockshaft extends completelythrough the casing I0 and into a bore or recess I9 which is provided inthe cover [2 to receive the inner end of the rockshaft. That portion ofthe rockshaft that is external to the easing is connected to a controllever so that the rockshaft may be manually rocked. The connectionbetween the rockshaft l8 and lever 20 may comprise a pin 2 I.

The lever 2!] is connected by means of the rockshaft l8 to a movable,member here. shown as taking the form of a; plate or diskr 22rwhichzmaybe fixed to the rockshaft l8 as by Welding at 23' (Figure 2). peripheryto receive the bent end of a control rod" 24 which may extend tospeedcontrol mechanism:

or other controllable devices. If used ona Diesel engine, for example,the control rod will extend to the governor for the engine:Substantially diametrically opposite the connection with the rod 24, theplate or disk 22 is formed-.withaanotch;

25 which extends angularly as respects, the axis. of the rockshaft IS,the notch thus bein provided with a pair of angularly spaced apart stopedges 26 and 21, each on a radius through the rockshaft'axis.

The cover l2"is drilled. on an axis parallelt'o the rockshaft axis l8,as at 28-, for the. purpose of carrying a: stop element designatedgenerally by the numeral 29' (Figure 2). This element preferably takestheform of a pin'havinga cylindrical stem 30 and an enlarged circular:head 3!; The diameter of the head 3| is substantially larger than thatof? the stem- 31 but is smaller than the angular distance betweentheedges 26 and 2'! on thedisk or plate 2.2: When the stop elementZBisin.the position shown in Figure 2', and in the position shown in: fulllines in Figure 3; the head 3! is in the notch: 255 between the stopedges 25 and Hand thus providesarr-abuts ment to be engaged by oneor'the' other: of the stopedges, For example; if'the control: lever" isrocked; in a i counterclockwise direction, as:viewed in Figure 3, thestop edge 26' will engage the i head of the pin or elementz29r If the:control lever ZB'is rocked. in theoppositedirecti'orr, the edge 21 mayengage the oppositeside: of. the head 31' of the pin or element; In thepresent-adaptationof the invention to: the control of a Diesel engine,the position of the lever 29 in which. the edge 26 engages thehead-31hr: the pinr29;.determines: the slow idle speedt-of'theengine;thatis, a speed at: which. the engine, will: turrr over smoothly withoutload; for example; 60.0 R; P: M. The position of; the; lever2B1in1Whithz-the edge 2;!" engages the opposite side of the head 3:11 ofthe pin' may determine a: speed: at which; the engine turns: over: at;say,. 9.60; to: l' l'ofi Rz 1?; M; Thus, it will! be seen; that the:control: lever has a wide range of. angular-movement; for' deterrmimingtwo difierent' operating? speeds of the engine a'ccordingto the limitsimposemby'thestop means comprising the; head 31 and. step edges; 25 and2:1. Normally; the lever Zitcannotbe. moved in a: counterclockwise:directiontbeyomr the engagement between the edge 25 and head 3|. of thepint 29; and hence the operator cannot inadvertently'cut oiT operationof: the engine:

According to the present invention; thestop' element or pin 29 iszshift'able: at; the: will; oti the operator to provide forincreasingthe: angular movement of the control lever 20,-. at least in a.counterclockwise directiom, so that the? operator may move the, lever20; to-- the: dot-dash position oi Figure 3, which position correspondsto. a. condition in which; operation. of: the engine is; discontinued;For this: purpose, thepinaZQ isshiftable: axially inwardly against a.compression spring: 32whiclris1sea-tedina bone: or, recess 33:

The plate is apertured adjacent its,

in the support or casing 10. The spring 32 serves to maintain the pin orelement 29 in its normal position, which is the position shown in Figure2. In this position, the right hand end of the stem 33 extendsexteriorly of the cover [2 to provide a portion that is available formanual control, which.c.ontrol.is, of course,. accomplished bydepressing the pin inwardly: Shifting-i or depressing of the pininwardly moves the head 3| out of the notch 25 and thus presents therelatively smaller diameter of the stem 30 as an abutment iii-the path.ofeither'of the edges 26 or 21, primarily the edge 26. The operator,then, by holdingjthe pin 23. in its inwardly depressed position, maymoverthe control lever 20 in a counterclockwise direction to thedot-dash line position shown in: Figure 3, whereupon the plate 22 willmove angularlytan increased distance until the edge 26 encounters orstops against the stem 30. With the parts in this position, the operatormay. release the pin 29; but it will be held" in its inner positionbecause of engagement of the head" 31 with' theportion'of the plate ordisk'22 bordering on the edge 26, as will be obvious from Figure 3.

Another feature-of the invention" resides in the means for frictionallycontrolling various posi tions ofthecontrol lever between thepositive-positions definedbythe stop mean-s described 'ab'ove'.Accordingly, the interior-surface of the cover' I2 is provided with aradial face 34" which is generally in the form ofan are about" ther-ockshaft axis. The arcuate radial face- 34 is interrupted at 35toprovide space for the end of the control rod 24. This detail isrelatively unimportant, it being necessary only'that the arcuate' extentof the face 34 be suflicient to accommodate the-range of" angularmovement of the disk 221 The disk 22, being a flat plate; hasoppositeradial faces; one of whichfrictionally contacts theradial face34 on the cover [2. In" the present construction, the disk 22is-formedof sheetmet'al; although a difierent material may be selected,if desired: The plate or disk 22-is held in frictional contact with theface 34- on the cover i2 by means of" a Hat member'36 and a compressionspring 31-. The general configuration of the flat member St is shownin-Figure3. This member is looseon' the rockshaft I8' and is interposedbetween theboss I-5'- and the inner radia-l-face'of the plate'or disk22. The member thus loosely depends fromthe rockshaf-t I8 andisprovidedwith acircular aperture 38 which receives a portion-of thehead'31- ofthe-pin-orstop element 29: The head 3lof the pi'nthus-holds themember 36 against rotation with the rockshaft l8 or plate 22. Thespri'ng37 isreoeived i'n the bore-or recess lfi inthecasing I0 and exerts aforce against the member 363 which in turn is: transferred to the plate22 and thence to-the' cover l2. The-member 36- is preferably formed orsheet metai; as-i'sthe-plate 22-, but may be formed of" differentmaterial, if desired; The pressure of the spring 37" is sumcient to holdthe plate or disk 22" 'in any; one of its adjusted positions againstordinary vibration incident to: the operation of the equipment withwhich the control device isused"; yet, the fric tional engagementbetween the-parts is suchas to permit the control lever Zl'lto be easilyand smoothly moved from one positiozrto another.

That portion of the boss l5orr theinterior" of the casing: I0 which isin proximity t'e-thelieati 31' of the pin 29 1s so-arrange'd as -toprovidea limit: to inward movement of the pin. That is to; say,depressing'of the pin 29 inwardly will re"- sultiimmoving: the head 31outof the path of able is greater than the thickness of the plate 22 butless than the thickness of the member 36.

Features of the invention other than those specifically pointed outabove will undoubtedly occur to those skilled in the art, as willnumerous modifications and alterations, all of which may be achievedwithout departing from the spirit and scope of the invention as definedin the appended claims.

What is claimed is:

1. A control device, comprising: a casing; a rockshaft carried by thecasing; a cover for the casing including a recess receiving an endportion of the rockshaft; means on the interior of the cover providing agenerally flat face radial to the rockshaft axis; a plate fixed to therockshaft within the casing and having opposite radial faces, one ofwhich contacts the cover face; a fiat member loose on the rockshaft andhaving opposite radial faces, one of which contacts the other plateface; spring means between the casing and the other face of the flatmember for pressing said member frictionally against the plate and theplate frictionally against the cover face; means on the plate providinga notch extending angularly as respects the rockshaft axis to provide apair of edges spaced angularly apart; a stop pin carried by the coverfor shifting along an axis parallel to the rockshaft axis and having agenerally cylindrical stem extending through the cover to the exteriorthereof, said pin having a generally circular exterior portion of thestem to move the head out of and the stem into the notch in the plate toprovide a second abutment, one of said edges to limit the angularmovement of the plate to a greater range; means providing an aperture inthe fiat member for receiving a portion of the head of the pin in eitherposition of the pin so that the head holds the flat member againstturning with the rockshaft; and biasing means operative between thecasing and the pin to yieldably hold the pin in and return the pin toits normal position.

2. A control device, comprising: a support; a rockshaft carried by thesupport; means on the support providing a generally flat face radial tothe rockshaft axis; a plate fixed to the rockshaft and having oppositeradial faces, one of which contacts the cover face; a flat member looseon the rockshaft and having opposite radial faces, one of which contactsthe other plate face; spring means between the support and the otherface of the flat member for pressing said member frictionally againstthe plate and the plate frictionally against the support face; means onthe plate providing a notch extending angularly as respects therockshaft axis to provide a pair of edges spaced angularly apart; a stoppin carried by the support for shifting along an axis parallel to therockshaft axis and having a generally cylindrical stem including at oneend a manually engageable portion and at its other end a generallycircular head of a diameter greater than that of the stem but less thanthe angularspacing between said edges on the plate and normally disposedwith the head in the notch and constituting an abutment to be engaged byat least on of said edges to limit angular movement of the plate to apredetermined range, said pin being shiftable via pressure on theaforesaid stem portion to move the head out of and the stem into thenotch in the plate to provide a second abutment, one of said edges tolimit the angular movement of the plate to a greater range; meansproviding an aperture in the flat member for receiving a portion of thehead of the pin in at least one position of the pin so that the headholds the fiat member against turning with the rockshaft; and biasingmeans operative between the support and the pin to yieldably hold. thepin in and return the pin to its normal position.

3. The invention defined in claim 2, further characterized in that:means is provided to limit shifting of the pin to an extent such thatthe head remains within the aperture in the flat member in eitherposition of the pin.

4. A control device, comprising: a support; a rockshaft carried by thesupport; means on the support providing a generally flat face radial tothe rockshaft axis; a plate fixed to the rockshaft and having oppositeradial faces, one of which contacts the cover face; a flat member looseon the rockshaft and having opposite radial faces, one of which contactsthe other plate face; spring means between the support and the otherface of the fiat member for pressing said member frictio-nally againstthe plate and the plate frictionally against the support face; means onthe plate providing a notch extending angularly as respects therockshaft axis to provide a pair of edges spaced angularly apart; andmeans carried by the support and extending through the notch to providean abutment engageable by at least one of the stop edges on the platefor limiting angular movement of the plate.

5. A control device, comprising: a support; a rockshaft carried by thesupport; means on the support providing a generally fiat face radial tothe rockshaft axis; a plate fixed to the rockshaft and having oppositeradial faces, one of which contacts the cover face; a flat member looseon the rockshaft and having opposite radial faces, one of which contactsthe other plate face; spring means between the support and the otherface of the flat member for pressing said member frictionally againstthe plate and the plate frictionally against the support face; means onthe plate providing a notch extending angularly as respects therockshaft axis to provide a pair of edges spaced angularly apart; andmeans carried by the support and extendin through the notch to providean abutment engageable by at least one of the stop edges on the platefor limiting angular movement of the plate, said means including aportion engaging the flat member to hold said member against turningwith either the rockshaft or plate.

6. A control device, comprising: a support; a rockshaft carried by thesupport; means on the support providing a generally fiat face radial tothe rockshaft axis; a plate fixed to the rockshaft and having oppositeradial faces, one of which contacts the cover face; a fiat member looseon the rockshaft and having opposite radial faces, one of which contactsthe other plate face; spring 1 means betWeenthe support a and a theother face lof the-fiatmember for pressing-said member fric--tionally--agai-nstthe plate and the platefrictionally-againstthesupport face; means on-theplate providing a notchextending angularly as re- -spects-the rockshaft axisto provide a-pairof -edges spaced angularly apart; and means carried *by'the support forselective positioning with respect to the plate and support and having aplurality of stop portions of different sizes selectively l rprojectableinto the notch and between-the stop edges .to present optionalabutmentsfor; limiting angular movement of the plate to different@theiflat member for pressing said member frictionally against the plateand theplate frictionally against the supportface; meansonlthe plateproviding a notch extending angularly as respects the rockshaft axis toprovide .a pair of edges spaced angularly apartyand means carried by thesupport for selectivepositioning with respect-to .the. plate and supportand-having apluralityof stop. portions of different sizes selectivelyproject- ..ableintothe notch and between the stop edges topresentoptional abutments for limiting angular movementof the plate todifferent ranges, said means-including a portion engageable with thefiat member in any position of said means to .hold said member againstturning with either the rockshaft or plate.

:8. In a control device including a support and samember carriedthereby-for rocking about {an axis: means on'the'member providing apairof stops spaced angularly apart aboutthe aforesaid axis andextending generally-radially:to provide a space between said stops; alimiting element shiftable between first and second positions along apath generally parallel to said .axis and through the space between saidstops, :saidelement having first and secondportions,'thezfirst portionbeing of a larger dimension than :the .other transverse to .the path ofshifting of said element but smaller than the angular distance betweensaid stops, said elementin one'position thereof presenting the firstportion as-an-abutment to the stops to limit angular movement of saidmember to a certain number of degrees, and said element in anotherposition thereof presenting the second portion as an abutmentto thestops to limit angular movement of thememberto a different number ofdegrees; and means biasing said element to one of its positions andproviding for shifting of the element to its other position.

9. In a control device including a support and a member movable thereonin oppositedirections along a defined path: means on the member providing a pair of stops spaced apart along the path of movement of themember; and a stop element carried by the support for selective movementbetween two positions with respect thereto and with-respect to themember and havingafirst portion normally interposed, in one position ofthe element, between the stops and engageable by the stops to limitmovement of the member in opposite directions, said element having asecond portion of different dimensions .than .the .first portionas'respects the spacing between the stops and positionable, in theotherposition of theelement, between the stops to establish differentlimits on the movement of the member in opposite directions.

10. In a control device includinga support and a member movable thereonin opposite directions along a defined path; meansprovidinga stop on themember; and a stop element carried by the support for selective movementbetween two positions with respect thereto and with respect to themember and having a first portionnormally interposed, in one position ofthe element in the path of the stop on the member to limit movement ofthe member in one direction, said element having a second portion ofdifierent .dimensions than the first portion as respects the path ofmovement of the stop on the member and positionable, in the otherposition of the element in the path of the stop to establish adifferent'limit on movement of the member in said one direction.

WALLACE H. .DU SHANE.

No references cited.

